Water is one of the most essential compounds for survival of life on the earth. Heavy metals viz. Mn, Mg, Fe, Ca, Zn, Cd, Pb, Cu and Hg in small tea gardens of Sonitpur district, Assam, have been analyzed in pre-monsoon season (month’s April and May 2009). The correlations between nine chemical parameters have been calculated and analysis carried out. Clusters of linked and non linked variables were separated out following average linkage method. The results of contamination in ground water are reported, which may cause a serious health problems to human beings.